CN112563692A - Capacitive coupling structure for dielectric filter - Google Patents
Capacitive coupling structure for dielectric filter Download PDFInfo
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- CN112563692A CN112563692A CN201910909445.4A CN201910909445A CN112563692A CN 112563692 A CN112563692 A CN 112563692A CN 201910909445 A CN201910909445 A CN 201910909445A CN 112563692 A CN112563692 A CN 112563692A
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- hole resonator
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- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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Abstract
The invention relates to the technical field of dielectric filters, in particular to a capacitive coupling structure for a dielectric filter, which comprises a dielectric filter body, wherein a second blind hole resonator is arranged on the left side of the dielectric filter body, a first blind hole resonator is arranged on the right side of the dielectric filter body, the first blind hole resonator is connected with the second blind hole resonator, a first blind groove is formed in one side, close to the second blind hole resonator, of the first blind hole resonator, a second blind groove for punching a dielectric block is formed in the middle of the lower end of the dielectric filter body, the second blind groove is located between the first blind hole resonator and the second blind hole resonator, the second blind groove is communicated with the first blind groove in a medium, and first coupling windows are formed in the middle of the front side and the rear side of the dielectric filter body.
Description
Technical Field
The invention relates to the technical field of dielectric filters, in particular to a capacitive coupling structure for a dielectric filter.
Background
Dielectric filters have been difficult to implement for capacitive coupling as an important component in communication systems. The previous solution, which achieves capacitive coupling by means of deep blind holes with a depth exceeding that of the dielectric block 1/2, has the disadvantage of generating additional resonances, reducing the rejection capacity of the filter. To this end, we propose a capacitive coupling structure for dielectric filters.
Disclosure of Invention
The present invention is directed to a capacitive coupling structure for a dielectric filter, which solves the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the capacitive coupling structure for the dielectric filter comprises a dielectric filter body, wherein a second blind hole resonator is arranged on the left side of the dielectric filter body, a first blind hole resonator is arranged on the right side of the dielectric filter body and connected with the second blind hole resonator, a first blind groove is formed in one side, close to the second blind hole resonator, of the first blind hole resonator, a second blind groove for driving a dielectric block is formed in the middle of the lower end of the dielectric filter body, the second blind groove is located between the first blind hole resonator and the second blind hole resonator and communicated with the first blind groove in the interior of a medium, and first coupling windows are formed in the middle of the front side and the middle of the rear side of the dielectric filter body.
Preferably, the cross section of the second blind groove and the cross section of the first blind groove are one of square, circle, ellipse and polygon.
Preferably, the dielectric filter body is respectively provided with a third blind hole resonator, a fourth blind hole resonator, a fifth blind hole resonator, a sixth blind hole resonator, a seventh blind hole resonator and an eighth blind hole resonator at equal intervals, a third blind groove is arranged on one side of the fourth blind hole resonator close to the seventh blind hole resonator, a fourth blind groove connected with the third blind groove is arranged in the middle of the inner cavity of the dielectric filter body, a through groove is arranged on the left side of the dielectric filter body and is positioned between the third blind hole resonator and the eighth blind hole resonator, a first transmission zero point and a second transmission zero point are respectively formed between the fourth blind hole resonator and the seventh blind hole resonator, and a third transmission zero point and a fourth transmission zero point are respectively formed between the third blind hole resonator and the eighth blind hole resonator, and second coupling windows are formed on two sides of the dielectric filter body.
The capacitive coupling structure for the dielectric filter has the advantages that: compared with the prior art, the invention has greater advantages, and does not generate extra resonant frequency outside the passband of the filter, thereby improving the out-of-band rejection capability of the filter.
Drawings
Fig. 1 is a schematic diagram of a capacitive coupling structure for a dielectric filter according to the present invention;
fig. 2 is a schematic diagram of a capacitive coupling structure for a dielectric filter according to the present invention;
fig. 3 is a schematic diagram of a capacitive coupling structure for a dielectric filter according to the present invention;
fig. 4 is a schematic diagram of a capacitive coupling structure for a dielectric filter according to the present invention.
In the figure: the resonator comprises a first blind hole resonator 1, a second blind hole resonator 2, a first blind groove 3, a second blind groove 4, a first coupling window 5, a third blind hole resonator 6, a fourth blind hole resonator 7, a fifth blind hole resonator 8, a sixth blind hole resonator 9, a seventh blind hole resonator 10, an eighth blind hole resonator 11, a third blind groove 12, a fourth blind groove 13, a through groove 14, a second coupling window 15, a first transmission zero 16, a second transmission zero 17, a third transmission zero 18 and a fourth transmission zero 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-4, a capacitive coupling structure for a dielectric filter, includes the dielectric filter body, the left side of dielectric filter body is equipped with second blind hole syntonizer 2, the right side of dielectric filter body is equipped with first blind hole syntonizer 1, first blind hole syntonizer 1 and second blind hole syntonizer 2 are connected, one side that first blind hole syntonizer 1 is close to second blind hole syntonizer 2 is equipped with first blind groove 3, the lower extreme middle part of dielectric filter body is equipped with second blind groove 4 of squeezing into the dielectric block, second blind groove 4 and first blind groove 3 cross section are square, circular, in ellipse and the polygon, the form is unrestricted, can show for multiple form, and the practicality is bigger, and various uses are worth promoting afterwards.
The second blind groove 4 is positioned between the first blind hole resonator 1 and the second blind hole resonator 2, the second blind groove 4 is communicated with the first blind groove 3 in a medium, and the middle parts of the front side and the rear side of the dielectric filter body are provided with first coupling windows 5;
the coupling quantity of the capacitive coupling structure is determined by the groove depth ratio of the first blind groove 3 and the second blind groove 4, the closer the groove depth ratio is to 1, the larger the coupling quantity is, the closer the groove depth ratio is to 0 or infinity, and the smaller the coupling quantity is; the coupling quantity of the capacitive coupling structure is related to the coupling window 5 between the two blind hole resonators, and the larger the coupling window 5 is, the smaller the coupling quantity is, and vice versa; the coupling quantity of the capacitive coupling structure is related to the intersected cross sectional area and the intersected vertical depth of the first blind groove 3 and the second blind groove 4, the larger the intersected cross sectional area is, the weaker the coupling is, the deeper the intersected vertical depth is, the weaker the coupling is, and vice versa;
the dielectric filter body is respectively provided with a third blind hole resonator 6, a fourth blind hole resonator 7, a fifth blind hole resonator 8, a sixth blind hole resonator 9, a seventh blind hole resonator 10 and an eighth blind hole resonator 11 at equal intervals, one side of the fourth blind hole resonator 7 close to the seventh blind hole resonator 10 is provided with a third blind groove 12, the middle part of an inner cavity of the dielectric filter body is provided with a fourth blind groove 13 connected with the third blind groove 12, the left side of the dielectric filter body is provided with a through groove 14, the through groove 14 is positioned between the third blind hole resonator 6 and the eighth blind hole resonator 11, a first transmission zero point 16 and a second transmission zero point 17 are respectively formed between the fourth blind hole resonator 7 and the seventh blind hole resonator 10, a third transmission zero point 18 and a fourth transmission zero point 19 are respectively formed between the third blind hole resonator 6 and the eighth blind hole resonator 11, two sides of the dielectric filter body are provided with second coupling windows 15;
the capacitive coupling structure is used for a 6-order dielectric filter, 4 transmission zeros are realized, and the out-of-band rejection characteristic of the filter is improved; as shown in fig. 3, the 6 blind hole resonators correspond to the resonance units 1, 2, 3, 4, 5, 6 in the equivalent circuit diagram, respectively. By introducing capacitive cross coupling between the resonator units 2 and 5, and with reference to fig. 4, a first transmission zero 16 and a second transmission zero 17 can be formed on both sides of the filter passband, and by introducing inductive cross coupling between the resonator units 1 and 6, two third transmission zeros 18 and fourth transmission zeros 19 can be formed on both sides of the filter passband.
As shown in fig. 2, the closer the blind slot 13 into which a medium is driven in a reverse offset manner is to the seventh blind hole resonator 10, the stronger the capacitive cross coupling formed between the fourth blind hole resonator 7 and the seventh blind hole resonator 10, and with reference to fig. 4, the first transmission zero 16 and the second transmission zero 17 are formed on both sides of the filter passband and are closer to the passband, and vice versa.
As shown in fig. 2, the closer the through-groove 14 for controlling the size of the coupling window between the fourth blind-hole resonator 7 and the seventh blind-hole resonator 10 is to the third blind-groove 12, the smaller the coupling window between the fourth blind-hole resonator 7 and the seventh blind-hole resonator 10 is, the stronger the capacitive cross-coupling formed between the fourth blind-hole resonator 7 and the seventh blind-hole resonator 10 is, and in conjunction with fig. 4, the first transmission zero 16 and the second transmission zero 17 are formed on both sides of the filter passband and are closer to the passband, and vice versa.
As shown in fig. 2, the larger the cross section of the intersection of the blind slot 12 and the blind slot 13 is, and the deeper the vertical depth of the intersection is, the weaker the capacitive cross coupling formed between the fourth blind hole resonator 7 and the seventh blind hole resonator 10 is, and in conjunction with fig. 4, the first transmission zero 16 and the second transmission zero 17 are formed on both sides of the filter passband and are further away from the passband, and vice versa.
As shown in fig. 2, the second coupling window 15 between the third blind-hole resonator 6 and the eighth blind-hole resonator 11, in conjunction with fig. 3, corresponds to the inductive cross-coupling between the resonance unit 1 and the resonance unit 6 in the equivalent circuit diagram. The larger the second coupling window 15, the stronger the inductive cross-coupling, and with reference to fig. 4, the third transmission zero 18 and the fourth transmission zero 19 are formed on both sides of the passband of the filter and are closer to the passband, or vice versa.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A capacitive coupling structure for a dielectric filter, comprising a dielectric filter body, the left side of the dielectric filter body is provided with a second blind hole resonator (2), the right side of the dielectric filter body is provided with a first blind hole resonator (1), the first blind hole resonator (1) is connected with the second blind hole resonator (2), a first blind groove (3) is arranged on one side of the first blind hole resonator (1) close to the second blind hole resonator (2), a second blind groove (4) for punching a dielectric block is arranged in the middle of the lower end of the dielectric filter body, the second blind slot (4) is positioned between the first blind hole resonator (1) and the second blind hole resonator (2), and the second blind groove (4) is communicated with the first blind groove (3) in the medium, the middle parts of the front side and the rear side of the dielectric filter body are provided with first coupling windows (5).
2. The capacitive coupling structure for a dielectric filter according to claim 1, wherein the second blind slot (4) and the first blind slot (3) have one of a square, a circle, an ellipse and a polygon cross section.
3. The capacitive coupling structure of claim 1, wherein the dielectric filter body is provided with a third blind-hole resonator (6), a fourth blind-hole resonator (7), a fifth blind-hole resonator (8), a sixth blind-hole resonator (9), a seventh blind-hole resonator (10), and an eighth blind-hole resonator (11) at equal intervals, one side of the fourth blind-hole resonator (7) close to the seventh blind-hole resonator (10) is provided with a third blind slot (12), the middle of the inner cavity of the dielectric filter body is provided with a fourth blind slot (13) connected with the third blind slot (12), the left side of the dielectric filter body is provided with a through slot (14), the through slot (14) is located between the third blind-hole resonator (6) and the eighth blind-hole resonator (11), and a first transmission zero (16) and a second transmission zero (17) are respectively formed between the fourth blind-hole resonator (7) and the seventh blind-hole resonator (10) A third transmission zero (18) and a fourth transmission zero (19) are respectively formed between the third blind hole resonator (6) and the eighth blind hole resonator (11), and second coupling windows (15) are formed on two sides of the dielectric filter body.
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| CN201910909445.4A CN112563692B (en) | 2019-09-25 | 2019-09-25 | Capacitive coupling structure for dielectric filter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0779104A (en) * | 1993-09-06 | 1995-03-20 | Murata Mfg Co Ltd | Dielectric resonator |
| US20070279150A1 (en) * | 2006-05-31 | 2007-12-06 | Reddy Vangala | Ceramic monoblock filter with inductive direct-coupling and quadruplet cross-coupling |
| CN109309272A (en) * | 2018-11-14 | 2019-02-05 | 苏州波发特电子科技有限公司 | A kind of capacitive coupling structure for dielectric filter |
| CN209266539U (en) * | 2019-02-22 | 2019-08-16 | 江西一创新材料有限公司 | A kind of dielectric filter coupled structure with symmetrical null characteristic |
| CN110265755A (en) * | 2019-07-19 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
| CN209434356U (en) * | 2019-03-21 | 2019-09-24 | 中兴通讯股份有限公司 | A kind of dielectric filter |
-
2019
- 2019-09-25 CN CN201910909445.4A patent/CN112563692B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0779104A (en) * | 1993-09-06 | 1995-03-20 | Murata Mfg Co Ltd | Dielectric resonator |
| US20070279150A1 (en) * | 2006-05-31 | 2007-12-06 | Reddy Vangala | Ceramic monoblock filter with inductive direct-coupling and quadruplet cross-coupling |
| CN109309272A (en) * | 2018-11-14 | 2019-02-05 | 苏州波发特电子科技有限公司 | A kind of capacitive coupling structure for dielectric filter |
| CN209266539U (en) * | 2019-02-22 | 2019-08-16 | 江西一创新材料有限公司 | A kind of dielectric filter coupled structure with symmetrical null characteristic |
| CN209434356U (en) * | 2019-03-21 | 2019-09-24 | 中兴通讯股份有限公司 | A kind of dielectric filter |
| CN110265755A (en) * | 2019-07-19 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
Non-Patent Citations (1)
| Title |
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| 王中锋等: ""一种容性输出耦合结构的可调多工器"", 《无线电工程》 * |
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